# Websites can block AI training by disallowing crawlers > Source: > Published: 2026-09-16 08:12:45.213417+00:00 [Hacker News](https://blog.cloudflare.com/accountable-mixed-use-ai-crawlers/) ### Websites can block AI training by disallowing crawlers Which summary reads better? Pick one — models revealed after.Both summaries are AI-generated. Websites can now block AI training crawlers like GPTBot while remaining fully discoverable to search indexers by configuring granular robots.txt and HTTP headers. For production RAG and agentic scraping pipelines, this will drastically reduce the volume of high-quality, real-time data accessible via standard web scraping. To maintain data ingestion pipelines, engineering teams must now pivot to API-first data retrieval or navigate highly-restricted crawler permissions. Google-Extended lets sites allow Googlebot for search discovery while separately disallowing use of their content for Gemini/Vertex AI training. For production LLM crawlers and agents, “publicly indexable” is no longer a sufficient permission signal; you need purpose-specific crawler identity and policy enforcement or your training pipeline will ingest content that publishers explicitly opted out of.